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<head><meta charset="utf-8"><title>match stress enum regression · t-compiler/performance · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/index.html">t-compiler/performance</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/match.20stress.20enum.20regression.html">match stress enum regression</a></h3>

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<a name="218237988"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/match%20stress%20enum%20regression/near/218237988" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> matthiaskrgr <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/match.20stress.20enum.20regression.html#218237988">(Nov 30 2020 at 00:16)</a>:</h4>
<p>It looks like there's a regression in the <code>match-stress-enum</code> test <br>
<a href="/user_uploads/4715/lqAXN-rKNZLWp-nTsw6fShX2/regression.png">regression.png</a> <br>
due to a rollup <a href="https://github.com/rust-lang/rust/commit/40d7efad5e581c60a81171d96d78696b7ed65009">https://github.com/rust-lang/rust/commit/40d7efad5e581c60a81171d96d78696b7ed65009</a><br>
but when I check the detailed numbers, I can't see anything suspicious, that's very odd<br>
<a href="https://perf.rust-lang.org/compare.html?start=914d07ae5f90f01f138e66807873295fceaa9a26&amp;end=40d7efad5e581c60a81171d96d78696b7ed65009&amp;stat=instructions:u">https://perf.rust-lang.org/compare.html?start=914d07ae5f90f01f138e66807873295fceaa9a26&amp;end=40d7efad5e581c60a81171d96d78696b7ed65009&amp;stat=instructions:u</a><br>
<a href="/user_uploads/4715/Jyg46WqK8b5dJUIhhfatv0wN/mseo.png">mseo.png</a> </p>
<div class="message_inline_image"><a href="/user_uploads/4715/lqAXN-rKNZLWp-nTsw6fShX2/regression.png" title="regression.png"><img src="/user_uploads/4715/lqAXN-rKNZLWp-nTsw6fShX2/regression.png"></a></div><div class="message_inline_image"><a href="/user_uploads/4715/Jyg46WqK8b5dJUIhhfatv0wN/mseo.png" title="mseo.png"><img src="/user_uploads/4715/Jyg46WqK8b5dJUIhhfatv0wN/mseo.png"></a></div><p>Am I doing something wrong?</p>



<a name="218239483"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/match%20stress%20enum%20regression/near/218239483" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/match.20stress.20enum.20regression.html#218239483">(Nov 30 2020 at 00:54)</a>:</h4>
<p><a href="https://perf.rust-lang.org/compare.html?start=6a889570e46c03d7b156ec08f3f4cb4d145924a3&amp;end=fd6b5376b723e22e3d98542e2e693d2717700900&amp;stat=instructions:u">https://perf.rust-lang.org/compare.html?start=6a889570e46c03d7b156ec08f3f4cb4d145924a3&amp;end=fd6b5376b723e22e3d98542e2e693d2717700900&amp;stat=instructions:u</a></p>



<a name="218239486"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/match%20stress%20enum%20regression/near/218239486" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/match.20stress.20enum.20regression.html#218239486">(Nov 30 2020 at 00:54)</a>:</h4>
<p>I don't know how you got your URL, but this seems to be the right one</p>



<a name="218239503"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/match%20stress%20enum%20regression/near/218239503" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/match.20stress.20enum.20regression.html#218239503">(Nov 30 2020 at 00:55)</a>:</h4>
<p>My guess is something stopped getting inlined due to different cgus</p>



<a name="218240234"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/match%20stress%20enum%20regression/near/218240234" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> matthiaskrgr <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/match.20stress.20enum.20regression.html#218240234">(Nov 30 2020 at 01:14)</a>:</h4>
<p>hm i clicked on the data point in the graph... <span aria-label="frown" class="emoji emoji-1f641" role="img" title="frown">:frown:</span></p>



<a name="218240331"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/match%20stress%20enum%20regression/near/218240331" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/match.20stress.20enum.20regression.html#218240331">(Nov 30 2020 at 01:17)</a>:</h4>
<p>Hm, not sure what's up. The picture of the graph doesn't have the right data point dot though. I also went via graph.</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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